feat(website): 官网企业版视觉升级

- 引入 Geist 字体，去除紫色渐变，克制阴影与交互态
- 导航/卡片/按钮统一企业风格，各区块视觉收敛

website/package-lock.json

@@ -9,6 +9,7 @@
       "version": "0.6.7",
       "dependencies": {
         "@fontsource/fira-code": "^5.3.0",
+        "@fontsource/geist": "^5.3.0",
         "@fontsource/inter": "^5.3.0",
         "@phosphor-icons/react": "^2.1.10",
         "react": "^18.3.1",
@@ -722,6 +723,15 @@
         "url": "https://github.com/sponsors/ayuhito"
       }
     },
+    "node_modules/@fontsource/geist": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/@fontsource/geist/-/geist-5.3.0.tgz",
+      "integrity": "sha512-u03ftlfVwb05uijq2jGDJ03/HKGqMKaNFk7KOhkpBUex8+BhrAOfMs/XciJ2UUNUX9fEsZbZQld/RWMA2oFU7g==",
+      "license": "OFL-1.1",
+      "funding": {
+        "url": "https://github.com/sponsors/ayuhito"
+      }
+    },
     "node_modules/@fontsource/inter": {
       "version": "5.3.0",
       "resolved": "https://registry.npmjs.org/@fontsource/inter/-/inter-5.3.0.tgz",